In order to meet future customer demands for more complete systems, including DESMI pumps, we are providing solutions and systems as well as single standard pumps or components. With focus on the individual needs from our customers we are providing solutions based on proven technology.
The key factors in all areas of the process industry are production reliability, productivity and performance.
These are precisely the areas addressed by the DESMI range of products, systems and services.
Value-added liquid transport solutions for local and global companies are our scope of supply.
Guangzhou Strong Chemical Co., Ltd. has used the ROTAN® ED pumps successfully since March 2014 and some of the highlights of their satisfaction with the pumps are:
In total eight ROTAN® ED 101 stainless steel pumps have been installed together with frequency driven motors equipped with force ventilation fan in order to adjust the flow needed under different working conditions.
Campco has used DESMI ROTAN® pumps, for many years without any breakdown. Campco is very much satisfied with the pump performance in the critical chocolate applications.
Why Campco choose DESMI ROTAN® pumps:
In South Africa there are many infrastructure projects which require either temporary or semi-permament fuel intallations (usually diesel). DESMI Modular S pumps are used for these installations.
Fuel installations need to be:
DESMI distributor in Southern Africa, Pumptec, has had a great deal of success in supplying Modular S pumps for containerized fuel units.
Huntsman Holland produces raw materials for the polyurethanes industry. Due to pump problems, the company was looking for a better solution.
Within the five facilities there are many pumps for the transport of the various raw materials. Previously pumps with mechanical seals were used, but which in practice were problematic, says Mechanical Maintenance Engineer, René van de Vlugt. “In this case, when these pumps exhibit leakage, it is not a particularly big problem for the environment and man. The spilled material hardens immediately when it comes in contact with the atmosphere...
A solution for this problem was found in magnetically coupled pumps from the ROTAN® ED Series.
DESMI NSL centrifugal pumps for heavy fuel oil transfer at the Dan-Balt A/S terminal in Aaberaa, Denmark.
General Manager Hardy Olsen requested pumps for the transfer of heavy fuel oil and the technical requirements for the future pumps were:
DESMI’s solution was three DESMI NSL 200-415 inline centrifugal pumps with 200 kW 4-pole motors incl. frequency converters for more flexibility.
The pumping liquid is ABS, Acrylonitrile-Butadiene-Styrene, a type of rubber solution widely used in the tire industry with low energy consumption, low noise and lighter weight.
For this project two pumps are to handle the medium “Rubber Solvent+Polystyrene+HCN” - CDEXXM-3U332, and as HCN is a very toxic medium, we supply double mechanical seal with API52 flush for these two pumps. The remaining seven pumps, handling mineral oil, are our standard stainless steel and cast iron pumps. After this phase one project, Huayi will launch another much bigger ABS project, so this could no doubt be a strategic project for DESMI ROTAN®.
Pumping Molten Sulphur is most challenging. Sulphur temperatures must be controlled within a 120-155o C range. Outside this temperature sulphur solidifies.
Sulphur has a distinct odour and is highly corrosive in the presence of moisture. Where leakage from common packed style pumps was unacceptable, a ROTAN® magnetically driven pump unit was offered on a trial basis where the chemical is used in the production of soap and shampoo.
Sound Refining Inc. of Tacoma, Washington provides bulk liquid storage and supplies fuels, lubricants, and other products and services to industry in the Pacific Northwest.
Within Sound Refining, the larger, bulk handling DESMI / ROTAN® pumps are proven among a list of products that range from Asphalt to Ethanol and everything in between. ROTAN®’s 8” ported model HD201 delivers flows in excess of 600 gpm and includes a 100 HP speed reduction drive.
Through the ages all kinds of seals have been used, from soft shaft seals to double mechanical shaft seals with DOP (dioctylphthalate) or mesamol under pressure between the seals. The results have been very mixed, but the risk of running into problems has been so big that it can only be recom-mended to implement these so-lutions if the customer himself takes the responsibility for the solution desired.
The only solution we can give our whole-hearted support is to use a MAGNETICALLY COU-PLED pump.
The pumps used have to be heated and have wear resistant bearings.
Tar is often transported in ships. The pumps on board bring the tar to the storage tank from which it is pumped to the distillation towers where it is fragmented. During the process about half the tar ends up as pitch.
This looks like a simple system but there are lots of details that have to be correct to avoid damage to the pumps. Koppers Denmark A/S are specialists in constructing pitch systems where ROTAN® magnetically driven pumps with bearings in solid tungsten carbide are used.
The pumps are used to transfer the highly purified liquids from film evaporator. Liquids could be lactic acid, fluid vitamin, vegetable oil or poly-glycol, kind of liquid fibre. Normally pump construction is CD26 with mechanical seal running at 500 rpm under differential pressure of 3~5 bar. The pumps are used with gearbox or equipped with Varied Frequency Driven motor.
The liquid container is under high vacuum with evaporation distillation working on top, and the gear pump shall run at low speed to bring the NPSHr down to a level below NPSHa from the system. This is majorly determined by the installation height difference (liquid flow down by self-gravity).
This is already the fifth time that Hexiang (the Thin Film Evaporator manufacturer) recommend the customers to choose or use DESMI ROTAN® gear pump, and we are glad to see this kind of strategic partnership bloom and grow.
Rotan Pumpengesellschaft GmbH built a test pump by means of standard parts from the CD + HD/PD pump ranges with stuffing box plus 2 special, machined parts as well as 2 special shaft seal rings and a ground rotor shaft coated with tungsten carbide at the shaft seal area. The pump was equipped with a short suction pipe from the seal housing to the suction side of the valve.
This pump, named CD81ERFT, code 3U22PAL, No. 268285, has been in intermittent duty for approx. 3-4 hours a day since the beginning of February 1997, 136 RPM x 5 bar x approx. 4000 cSt, without leakage.